add explain index allocation

cmd/index.go

@@ -38,6 +38,7 @@ func Index(conf *cfg.Config) *cli.Command {
 			IndexCreate(conf),
 			IndexDelete(conf),
 			IndexClose(conf),
+			IndexAllocation(conf),
 		},
 	}
 }
@@ -75,6 +76,33 @@ func IndexList(conf *cfg.Config) *cli.Command {
 	}
 }
 
+func IndexAllocation(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:    "allocation",
+		Aliases: []string{"a"},
+		Usage:   "explain index allocation",
+
+		Flags: []cli.Flag{
+			&cli.IntFlag{
+				Name:        "shard",
+				Usage:       "shard number to explain for",
+				Destination: &conf.Shards,
+				Aliases:     []string{"s"},
+			},
+			&cli.BoolFlag{
+				Name:        "primary",
+				Usage:       "explain primary allocation (default true)",
+				Destination: &conf.Primary,
+				Aliases:     []string{"p"},
+			},
+		},
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			return es.IndexAllocation(conf, cmd.Args().Get(0))
+		},
+	}
+}
+
 func IndexShow(conf *cfg.Config) *cli.Command {
 	return &cli.Command{
 		Name:    "show",